How many students in this group take every one

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Reference no: EM13306123

There are some five courses offered in a semester. The group of students who take at least one of these courses consists of 155 students. There are 80 students registered in each course. For any two among these courses, there are precisely 40 students who take each of them. For any three of these courses, there are precisely 20 students who take each of them. For any four among these courses, there are precisely 10 students who take each of them. How many students in this group take every one among the five courses in this semester?

Reference no: EM13306123

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